body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
}

header {
  background: #333;
  color: #fff;
  padding: 1rem 0;
  text-align: center;
}

main {
  padding: 1rem;
}

.stocks-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1rem;
}

.stock-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 1rem;
}

.stock-card h3 {
  margin-top: 0;
}